I love the combo SadieLorraine. I do know of two dogs named Sadie, and you should know that you'll probably be told that for a while, but so what? I also know dogs named Sophie, Thomas, Lily, Maxine, Charley and so on. I don't love that people are just using their favorite "people names" for dogs but it's happening so I don't think any name is safe. Sadie is nicknamey but that is very of the moment right now so I don't think it will bother her in her personal or professional life later on. She'll be surrounded by many peers that also have nicknames as full names. I also really like how Lorraine is meaningful to you, and so unexpected in the middle. Beautiful choice- don't doubt it